Drilling mechanism



E. G. GAR'TIN DRILLING MECHANISM Dec. 2s, 1926. 1,612,784

Filed March 5, 1925l Patented Dec. 28, 1926.

nerr-sn stares 1,612,784 PATENTv OFFICE.

ELMEB G. GARTIILfOF CLAREMONT, NEW HAMES'/REVASSIGNOB TO SULLIVAN MA-CHINERY COMPANY,.A CORPORATION OF; MASSACHUSETTS.

DRILLING MnoHnNrsM,

My invention relates to drilling mechanisms and more particularly toimproved tool retainer means for such mechanisms.

An object of my invention is to provide an c improved,drillingmechanism. Another object of my invention is to provide an improvedhammer drilling mechanism having improved tool retaining means therefor.

Still another object of my invention is to .i provide improved resilienttool retaining means which jinafy1 be adjusted withY facility with aminimum of edort. A. still further object ofmy invention is to providean improved tool retainingrmeans having an, imla proved resilientmounting therefor wherein the shocks upon thei retainer encounteredduring the drilling, operation are readily absorbed and wherein breakageis reduced to a minimum. These and other'objects andadc vantages-of myinvention will, however,

hereinafter morel fully appear.

In the accompanying drawings I have shown-for purposes of illustrationone form which my invention may assume in practice..

Fig. I is a plan elevation .of a forward portion of a hammer. drillingmechanism incorporating my improved device, the view being partially.in. sectionto facilitate illus- L' tration.

Fig. 2 isa sideY elevationofthe mechanism shown in Fig.l l, the viewbeing partially broken. away in section..-

Fig'. 3. is a front end, elevation ofAFig. 1, my. improved tool retainerbeing shown in a plurality of positions. I

In this illustrative embodiment of my invention I have shown a forwardportion of a hammer drilling mechanism which may be of any standard formand which herein comprises a chuck housing l adapted to receive a usualcollared drill steel 2. The chuck housing I is provided with laterallugs 3 through which `usual side vrods l are adapted to pass and theseside rods are encircled at their forward ends by coiled springs 5 whichact at one end against washers 6 engaging arcuate surfaces 7 formed onthe forward surfaces of the lugs 3 while at the other end the springsengage suitable annular washers 8, the tension of the springsbeing'adjusted bi i means of suitable nuts 9 threaded on the forwardends of the side rods 4L. It will herein be noted that the side rods 4and the springs 5 resiliently maintain the parts of f projecting abutagainst a transversely disposed retainer yoke 14. Asillustraterhtheretainer yoke 14 is pivotally mounted, as at l5, on oneof the side rods 12 whilethe other end is provided with. an arcuatelslot 16 which permits transverse-swinging movement of the yoke relativeto the other siderod l2. Tension is maintained onl the lrods 12 by meansof coil'edsprings 17 which encircle rearwardly portions of; the siderods 12 and which reactat one endi against suitable washers 18 engagingthe rear surface of the bosses 1G and at. the other end against suitablewashersA 19 engaging adjustable nuts 20 thread'edon, the rods and bymeans of which nuts 2O the tensionfofthe coiled springs may be adjusted'. As sh own, lthe'forward surface offeneof the bosses 10 isnotched, as at 2l, (see: Fig. 2.)V with which Yal projection 22 formed,onthe rear surface of the retainer yokeis ,adapted to cooperate. Thisnotch and projection enables the retainer to be locked in its operativeor retaining position. In the use of my improved retaining means it willherein be noted that when it is desired to remove the steel from thechuck housing the operator grasps the retainer yoke and swings thelatter downwardly (see Fig. 3), the projection being released from thenotch 21 at that time and the spring 17 compressingupon such release.IVhen the new steel. is inserted within the chuck housing the 'retaineryoke is then swung upwardly until the projection 22 again snaps withinthe notch 21, consequently locking the retainer yoke in its operativeretaining position. As a result of my improvement it will herein benoted that improved retaining means are provided wherein the same mayadj-usted with facility. it will further qux) be noted that an improvedresilient mounting is provided for the retaining means wherein theconstant hammering shocks enacted thereupon are substantially lessenedor obviated, both the side rod springs and the retainer springsabsorbing the shock. t wiil also be noted that improved retainer meansare provided of an exceedingly simple and rugged character which may beapplied to a standard hammer drilling mechanisni with a n'iinimum ofchange and eX- pense.

lVhile l have in this application specifically described one form whichmy invention may assume in practice, it will be understood that thisform of the same is shown for purposes of illustration and that theinvention may be niodilied and embodied in various other forms withoutdeparting from its spirit or the scope of the appended claims.

That l claim as new andV desire to secure by Letters Patent is:

l. A drilling machine comprising a plurality of members including achuck housing, means including side rods for holding said memberstogether, tool retaining means comprising` lugs formed on said housing,side rods slidable in said lugs, a transversely swingable yoke carriedby said rods ani swingable in a plane transverse to said sine rods,means affording a resilient mounting for said yoke, and locking meanscomprising interlockin0` portions on one of said lugs and on said yokerespectively. Y

2. A drilling machine comprising a plurality of members including achuck-housing, means including side rods for holding said memberstogether, tool retaining means comprising lugs formed on said housing,side rods slidable iu said lugs, a transversely swingable yoke carriedby said rods and swing-able in a plane transverse to said side rods,means affording a resilient n'iounting for said yoke, and locking meanscomprising a locking tooth Ytermed on said yoke and a cooperating` toothreceiving notch formed in one of said lugs.

8. A drilling machine comprising a plu-Y rality of members including achuck housf ing, means Jfor holding said members together, toolretaining means comprising laterally spaced lugs formed on said chuckhousing and extending forwardly therefrom, side rods slidably mounted insaid lugs, a transversely swingable yoke carried by said side rods andswingable in a plane trans- Yerse to said side rods, and meansVrespectively formed on said yoke and on one of said lugs for locking thesame in a predetermined position.

il. A drilling machine'comprising a plurality of members including achuck housing.v means for holding said members to- ;gether, toolretaining means con'iprising laleral lugs formed on said chuck housingand extending forwardly therefrom, side rods slidably mounted in saidlugs, tensioning means positioned about said rods at therear ends ofsaid lugs, a transversely swingable yoke carried by said side rods andsWingable in a plane transverse to said side rods, a locking tooth onsaid yoke, and a cooperating noteb in one of said lugs.

5. A drilling machine comprising a plurality of members including achuck housing, means for holding said members together, tool retainingmeans comprising lateral ings formed on said chuck housing and'extending forwardly therefrom, side rods siidably mountedy in saidlugs, tensioning means positioned about said rods at the rear ends ofsaid lugs, means forY Varying the tension of said springs, atransversely swingable yoke carried by said side rods find swingable ina plane transverse to said side rods, a locking toothV on said yoke, anda cooperating notch in one of said lugs.V

l'n testimony' whereof I affix my signature,

ELMER G. GARTIN.

